/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.rest.service.api.runtime.process;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.activiti.engine.FormService;
import org.activiti.engine.form.FormProperty;
import org.activiti.engine.form.StartFormData;
import org.activiti.engine.impl.form.EnumFormType;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.Map;

/**
 * @author Tijs Rademakers
 */
@RestController
public class ProcessDefinitionPropertiesResource {

    @Autowired
    protected FormService formService;

    @Autowired
    protected ObjectMapper objectMapper;

    @RequestMapping(value = "/process-definition/{processDefinitionId}/properties", method = RequestMethod.GET, produces = "application/json")
    public ObjectNode getStartFormProperties(@PathVariable String processDefinitionId) {
        StartFormData startFormData = formService.getStartFormData(processDefinitionId);

        ObjectNode responseJSON = objectMapper.createObjectNode();

        ArrayNode propertiesJSON = objectMapper.createArrayNode();

        if (startFormData != null) {

            List<FormProperty> properties = startFormData.getFormProperties();

            for (FormProperty property : properties) {
                ObjectNode propertyJSON = objectMapper.createObjectNode();
                propertyJSON.put("id", property.getId());
                propertyJSON.put("name", property.getName());

                if (property.getValue() != null) {
                    propertyJSON.put("value", property.getValue());
                } else {
                    propertyJSON.putNull("value");
                }

                if (property.getType() != null) {
                    propertyJSON.put("type", property.getType().getName());

                    if (property.getType() instanceof EnumFormType) {
                        @SuppressWarnings("unchecked")
                        Map<String, String> valuesMap = (Map<String, String>) property.getType().getInformation("values");
                        if (valuesMap != null) {
                            ArrayNode valuesArray = objectMapper.createArrayNode();
                            propertyJSON.put("enumValues", valuesArray);

                            for (String key : valuesMap.keySet()) {
                                ObjectNode valueJSON = objectMapper.createObjectNode();
                                valueJSON.put("id", key);
                                valueJSON.put("name", valuesMap.get(key));
                                valuesArray.add(valueJSON);
                            }
                        }
                    }

                } else {
                    propertyJSON.put("type", "String");
                }

                propertyJSON.put("required", property.isRequired());
                propertyJSON.put("readable", property.isReadable());
                propertyJSON.put("writable", property.isWritable());

                propertiesJSON.add(propertyJSON);
            }
        }

        responseJSON.put("data", propertiesJSON);
        return responseJSON;
    }
}
